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Evidence-Based Supplement Research
Evidence-Based Supplement Research
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Big effect

L-arginine at 6g/day drove a sharp rise in nitric oxide levels (p<0.001) in a 60-day trial — but the study was open-label and limited to patients with leg artery disease.

This is among the first indexed studies on L-arginine for nitric oxide, so the finding is promising but far from settled — especially since the same trial found no effect on cholesterol or ankle-brachial index, and the open-label design means expectations could have influenced results.

Nitric oxide relaxes blood vessels and improves circulation. In this 60-day trial, 100 patients with blocked leg arteries (Fontaine stage II) who took 6g/day of L-arginine showed a statistically significant increase in nitric oxide levels compared to controls. However, the study was open-label (no placebo blinding), and other key measures like walking distance and antioxidant enzymes improved, while cholesterol and ankle-brachial index did not — so the benefit appears real but narrow and may not apply to healthy people.

Where this fits in the evidence

This is among the first studies we've indexed on L-Arginine for Increased Serum Nitric Oxide Level — treat it as an early signal until more research accumulates.

The study

Assessment of the effectiveness and safety of two-month oral supplementation with L-arginine depending on the type of lipid metabolism disorder in patients with atherosclerotic lower limb ischemia.

  • Randomized Controlled Trial (RCT)
  • n = 100
  • 2025-10-01
  • Journal of physiology and pharmacology : an official journal of the Polish Physiological Society
More on L-ArginineMore on Increased Serum Nitric Oxide Level

This is a plain-language summary of a research finding, not medical advice. Pillser surfaces research signals to help you decide what's worth investigating — always consult a qualified professional before changing what you take.

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